package org.shj.netty.chartper2.nio;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;

public class TimeClientHandle implements Runnable{

	private String host;
	private int port;
	private Selector selector;
	private SocketChannel socketChannel;
	private volatile boolean stop;
	
	public TimeClientHandle(String host, int port){
		this.host = host;
		this.port = port;
		
		try{
			selector = Selector.open();
			socketChannel = SocketChannel.open();
			
			socketChannel.configureBlocking(false);
		}catch(Exception e){
			e.printStackTrace();
			System.exit(-1);
		}
	}
	
	public void run(){
		try{
			doConnect();
		}catch(Exception e){
			e.printStackTrace();
			System.exit(-1);
		}
		
		while(!stop){
			try{
				selector.select(1000);
				Set<SelectionKey> selectedKeys = selector.selectedKeys();
				Iterator<SelectionKey> it = selectedKeys.iterator();
				
				SelectionKey key = null;
				
				while(it.hasNext()){
					key = it.next();
					it.remove();
					try{
						handleInput(key);
					}catch(Exception e){
						if(key != null){
							key.cancel();
							if (key.channel() != null){
								key.channel().close();
							}
						}
					}
				}
				
			}catch(Exception e){
				e.printStackTrace();
				System.exit(-1);
			}
		}
		
		if(selector != null){
			try{
				System.out.println("selector.close()");
				selector.close();
			}catch(IOException e){
				e.printStackTrace();
			}
		}
		
	}
	
	private void handleInput(SelectionKey key) throws IOException{
		System.out.println("handleInput()");
		if(key.isValid()){
			System.out.println("key.isValid()");
			SocketChannel sc = (SocketChannel) key.channel();
			if(key.isConnectable()){
				if(sc.finishConnect()){
					sc.register(selector, SelectionKey.OP_READ);
					System.out.println("Invoke doWrite() in handleInput()");
					doWrite(sc);
				}else
					System.exit(1); //connection is failed.
			}
			
			if(key.isReadable()){
				System.out.println("key.isReadable()");
				ByteBuffer readBuffer = ByteBuffer.allocate(1024);
				int readBytes = sc.read(readBuffer);
				
				if(readBytes > 0){
					System.out.println("readBytes > 0");
					readBuffer.flip();
					byte[] bytes = new byte[readBuffer.remaining()];
					readBuffer.get(bytes);
					String body = new String(bytes, "UTF-8");
					System.out.println("Now is : " + body);
					this.stop = true;
					
				}else if(readBytes < 0){
					System.out.println("readBytes < 0");
					//对端链路关闭
					key.cancel();
					sc.close();
				}else{
					System.out.println("readBytes = 0");
					//do nothing
				}
			}
		}
	}
	
	private void doConnect() throws IOException{
		System.out.println("doConnect()");
		if(socketChannel.connect(new InetSocketAddress(host, port))){
			System.out.println("socketChannel.connect");
			socketChannel.register(selector, SelectionKey.OP_READ);
			System.out.println("Invoke doWrite() in doConnect()");
			doWrite(socketChannel);
		}else{
			System.out.println("socketChannel not connect");
			socketChannel.register(selector, SelectionKey.OP_CONNECT);
		}
	}
	
	private void doWrite(SocketChannel sc) throws IOException{
		System.out.println("doWrite()");
		byte[] req = "QUERY TIME ORDER".getBytes();
		ByteBuffer writeBuffer = ByteBuffer.allocate(req.length);
		writeBuffer.put(req);
		writeBuffer.flip();
		sc.write(writeBuffer);
		
		if(!writeBuffer.hasRemaining()){
			System.out.println("Send order 2 server succeed.");
		}
	}
}
